title: Type I phosphatidylinositol 4-phosphate 5-kinase γ is required for neuronal migration in the mouse developing cerebral cortex.
abstract: Type I phosphatidylinositol 4-phosphate 5-kinase (PIP5KI)γ is one of the phosphoinositide kinases that produce phosphatidylinositol 4,5-bisphosphate, which is a critical regulator of cell adhesion formation, actin dynamics and membrane trafficking. Here, we examined the functional roles of PIP5KIγ in radial neuronal migration during cortical formation. Reverse transcription-polymerase chain reaction analysis revealed that PIP5KIγ_v2/v6 and PIP5KIγ_v3 were expressed throughout cortical development with distinct expression patterns. In situ hybridisation analysis showed that PIP5KIγ mRNA was expressed throughout the cortical layers. Immunohistochemical analysis revealed that PIP5KIγ was localised in a punctate manner in the radial glia and migrating neuroblasts. Knockdown of PIP5KIγ using in utero electroporation disturbed the radial neuronal migration and recruitment of talin and focal adhesion kinase to puncta beneath the plasma membrane. The same inhibitory effect on neuronal migration was observed by overexpression of a catalytically inactive mutant of PIP5KIγ_v2 but not PIP5KIγ_v1 or PIP5KIγ_v3. These findings suggest an essential role of PIP5KIγ, particularly PIP5KIγ_i2, in neuronal migration, possibly through recruitment of adhesion components to the plasma membrane.
authors.affiliation: Department of Anatomy, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Hara
authors.forename: Masahiro
authors.initials: M
authors.lastname: Fukaya
authors.forename: Hideaki
authors.initials: H
authors.lastname: Tamaki
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Sakagami
mesh_terms: D000818:Animals; D002465:Cell Movement; D002540:Cerebral Cortex / Q000166:cytology / Q000196:embryology* / Q000378:metabolism; D063928:Ependymoglial Cells / Q000201:enzymology / Q000378:metabolism; D051379:Mice; D008813:Mice, Inbred ICR; D058953:Neural Stem Cells / Q000201:enzymology* / Q000378:metabolism; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000378:metabolism*
chemical_list: D017853:Phosphotransferases (Alcohol Group Acceptor); C020077:1-phosphatidylinositol-4-phosphate 5-kinase
keywords: cerebral cortex; focal adhesion; phosphatidylinositol 4-phosphate 5-kinase; phosphoinositide; radial migration